The MK Team has a knack of making up fake rumors to make themselves look smart.
"The box art has a secret about the next game."
"The website url has reveals the secret about how to look for the secret that reveals the secret."
"If you play the game 20 times with all flawless victories using only the select button, then walk outside and bang your head against a green mailbox ten times, smash your playstation with a hammer, then buy a new one and put the game in, you will unlock something special."
They also promise things for future games and then quietly omit then when no one's looking.
"Why we didn't have more characters...? Oh, uh...I guess...too little time? Yeah, I'm going with that."
"Lack of fatalities? Oh, uh....we wanted to get an early start on the next game. That's why."
"Shitty plot and no real endings? Uh...let's see...it was...too hard."